We tried to record sum signal at several powers without success. For some reason the X and Y amplitudes were really disturbed (jumpy), so as the sum. On low power around .20W they were constant, but as soon as we got above .70W they were really disturbed. And also, every time we increased the power we had to adjust the x and y amplitudes. The pictures in the corresponding link show that:

We tried to record sum signal at several powers without success. For some reason the X and Y amplitudes were really disturbed (jumpy), so as the sum. On low power around .20W they were constant, but as soon as we got above .70W they were really disturbed. And also, every time we increased the power we had to adjust the x and y amplitudes. The pictures in the corresponding link show that:

http://www.evernote.com/pub/pranavrathi1/04092010

http://www.evernote.com/pub/pranavrathi1/04092010

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:[[User:Steven J. Koch|Steve Koch]] 23:13, 9 April 2010 (EDT): Hmm, strange! I don't have any ideas for why that happened...

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===Power Step-Up Beam Profile experiment===

===Power Step-Up Beam Profile experiment===

I have successfully finished the starting modifications for this experiment. I checked a new set-up to record the beam profile. It worked well. In the set-up I did not use any lens to project the beam at CCD. I noticed some new patterns, which were arise from the AOM: http://openwetware.org/wiki/Koch_Lab:Research/AOD_tidbits

I have successfully finished the starting modifications for this experiment. I checked a new set-up to record the beam profile. It worked well. In the set-up I did not use any lens to project the beam at CCD. I noticed some new patterns, which were arise from the AOM: http://openwetware.org/wiki/Koch_Lab:Research/AOD_tidbits

These patterns were really destroying the beam profile of first order at the high power. One possible solution of the problem is use a lens to project the beam; which I will work on as as soon as I finish the sum signal experiment.

These patterns were really destroying the beam profile of first order at the high power. One possible solution of the problem is use a lens to project the beam; which I will work on as as soon as I finish the sum signal experiment.

Revision as of 23:13, 9 April 2010

Today Experiments

Sum Signal Experiment

We tried to record sum signal at several powers without success. For some reason the X and Y amplitudes were really disturbed (jumpy), so as the sum. On low power around .20W they were constant, but as soon as we got above .70W they were really disturbed. And also, every time we increased the power we had to adjust the x and y amplitudes. The pictures in the corresponding link show that:
http://www.evernote.com/pub/pranavrathi1/04092010

Steve Koch 23:13, 9 April 2010 (EDT): Hmm, strange! I don't have any ideas for why that happened...

Power Step-Up Beam Profile experiment

I have successfully finished the starting modifications for this experiment. I checked a new set-up to record the beam profile. It worked well. In the set-up I did not use any lens to project the beam at CCD. I noticed some new patterns, which were arise from the AOM: http://openwetware.org/wiki/Koch_Lab:Research/AOD_tidbits
These patterns were really destroying the beam profile of first order at the high power. One possible solution of the problem is use a lens to project the beam; which I will work on as as soon as I finish the sum signal experiment.